Dental swage.



J. B. SEDBERRY.

DENTAL SWAGE.

APPLICATION FILED MAY 25, 1911.

Patented Feb. 6, 1912.

WITNESSES a a iRMH/Y A TTORNEYS JAMES BERNARD SEDBERRY, OF THOMPSQNS STATION, TENNESSEE.

DENTAL SWAG-E.

Specification of Letters Patent.

Application filed May 25, 1911.

Patented Feb. 6, 1912.

Serial No. 629,414.

To all whom it may concern:

Be it known that I, JAMES BERNARD SE1)- BERRY, a citizen of the United States, and a resident of Thompsons Station, in the county of Williamson, State of Tennessee, have invented a new and useful Improvement in Dental Swages, of which the following is a specification.

My invention is an improvement in swages, and has for its object the provision of a device of the character specified especially adapted for dentists use, and by means of which swaging of all kinds may be expeditiously and easily performed.

In the drawings: Figure 1 is a front view of the improvement; Fig. 2 is a vertical section; Fig. 3 is a top plan view of the base; Fig. 4 is a section on the line 44 of Fig. 2; Fig. 5 is a perspective view of the lower end of the body looking from below; and Fig. 6 is a similar view ofthe plate flask looking from above.

The present embodiment of the invention comprises a base in the form of a circular disk 1, having its edge beveled at 2 and the upper face of the disk is provided with an annular rib 3 coaxial with the disk. The disk is also provided with an upwardly extending pin 4 at one side of the rib and with a plurality of openings 5 for receiving screws or the like to hold the base to a suport.

p The upper end of each opening 5 is counterbored, as indicated at 6, and a body 7 is seated on the base. The body is sub stantially cylindrical in form, open at its top and closed at its bottom, as indicated at 8. The under face of the bottom is provided with an annular groove 9 for receiving the rib 3, and with an opening 10 at one side of the groove for receiving the pin 4. The body is also provided with an opening 11 in its side wall of suflicient size to permit the insertion and removal of the flasks, to be described, and is also internally threaded at its upper end, as indicated at 12. A hollow plunger 13 fits in the body and is externally threaded, as indicated at 14, to engage the thread 12 of the body.

The bore 18 of the hollow plunger is counterbored at 16 at its lower end, and at its upper end the plunger is provided with an annular radial flange 17 forming a hand Wheel for rotating the plunger. It will be evident that when the plunger is rotated it will be raised or lowered in the body, depending upon the direction of rotation.

A solid plunger 15 is frictionally slidable in the bore of the plunger 13 and is provided at its upper end with an annular radial flange 19, forming a head for the plunger, and limiting the downward movement thereof with respect to the plunger 13. Three flasks 20, 21 and 22 are provided for use in the body, and the said flasks are arranged to be nested, as'indicated in Fig. 2. The outer flask 20 is the plate flask and is used alone in swaging plates. The said flask is cylindrical externally, and the bore 23 there of is tapering or frusto-conical. The flask is also provided at its lower end with an annular radial rib or flange 24, fitting against the inner face of the body and retaining the bore of the flask co-axial with the body and base. The inner surface or bore of the flask is provided with alongitudinal rib 25 for apurpose to be described, and the bottom of the flask rests upon the upper face of the bottom of the body when the flask is in place. The intermediate or bridge flask 21 is frusto-conical or tapering and the outer face thereof is provided with a longitudinal groove 26, in which fits the groove 25 of the flask 20, to prevent rotation of the flasks on each other. The said flask is also provided with a longitudinal rib 27 on its inner face which fits into a similarly shaped groove 28 in the outer face of the inner or crown flask 22. The said flask 22 is frusto-conical in shape and enough smaller than the flask 21 to fit smoothly therein. The flasks are placed in the usual manner over the impression on a layer of molding sand, and fusible metal is poured therein, forming the die. The said metal is indicated by the reference character 29 in Figs. 2 and 4, and the inner face of the flask 22 is provided with a longitudinal rib 30, which forms a groove in the block or plug 29 of fusible metal.

The ribs 25, 27 and 30 of the flasks perform three functions: First. That of preventing angular movement of the flasks with respect to each other, or with respect to the plug 29 of metal. Second. That of acting as an indicator to correctly replace the block or plug of metal, that is, the die, and third, that of aiding as a guide to the splitting of the metal, if this should be necessary,

The counterbore 16 of the hollow plunger 'is designed to receive wax, and it will be noticed that the diameter of the counterbore or recess is approximately equal to the external diameter of the body of the plate flask. When using the plate flask 20 alone,

the crown and bridge flasks are removed, and when using the bridge flask 21 the crown flask 22 is removed.

In operation, to make a plate, an impression is first obtained by flowing a film of wax now brought to a state of fusion and skimmed to remove the slag impurities, and is then poured into the flask over the impression on the sand. The alloy is then struck off flush with the upper end of the flask by means of a spatula or other suitable instrument. The flask is now lifted from the sand, carrying impression and alloy therewith, washed thoroughly with cold water, and the impression is jarred loose and.

removed. If the die or mold is perfect, the

operation of swaging follows. The cavity inthe lower end of the plunger is filled with beeswax, and the material 31 intended to be used for the plate is placed over the die in the plate flask. A thin piece of rubber or cloth is placed on the material of the plate and the flask is inserted in the body of the device, and the hollow plunger is screweddown as far as possible to bring the solid plunger into contact with the plate,

- it being understood that the large end of the flask is now upward. The head of the plunger is now struck, preferably by a wooden mallet, two or three good blows, commencing with light strokes and increasing to heavy, until the material is swaged. Plates of any material may be swaged, either gold, platinum or sliver.

In making crowns the die is prepared in the usual manner, and is placed in the crown flask, which in turn is placed in the plate flask, andthe operation is practically the same as that just'described, with the necessary modifications for the class of work.

' I claim:

1. A device of the character specified,

comprising a base having an annular rib on its upper face, and having a pin at one side of the rib, a substantially cylindrical body having an open top and a closed bottom provided onits under face with an annular groove receiving the rib, and an opening for receiving the pin, said body having an opening in its side wall and being internally threaded at its top, a plunger threaded into the body and having an annular radial flange at its upper end, said plunger having a central longitudinal bore coaxial with the body, and a counterbore at the inner end of the longitudinal bore, a solid plunger slidable in the bore of the first named plunger and provided with an annular radial flange at its upper end, and a plurality of nested flasks in the body, each of the flasks having a frusto-conical bore provided with a longitudinal rib, the outer" most flask having an annular rib engaging the inner face of the body, and the inner flasks having on their outer surfaces a vertical groove for receiving the rib of the adjacent flask.

2. A device of the character specified, comprising a substantially cup-shaped body having an opening in its side, a plurality of nested flasks in the body and resting on the bottom thereof, the inner flasks being frusto-conical in shape and the outermost flask having a cylindrical outer surface for engaging the inner surface of the body to hold the flasks co-axial to the body, each flask having an internal longitudinal rib, and the inner flasks having each an external longitudinal groove for receiving the rib of the adjacent flask, the opening in the side wall of the body being of sufficient size to permit the insertion and the removal of the flasks, a plunger threaded into the upper end of the body, said plunger having a central longitudinal bore and a counter bore at the inner end of the longitudinal bore, and a solid plunger slidable in the bore.

3. A device of the character specified, comprising a substantially cup-shaped body having an opening in its side, a plurality of nested flasks in the body and resting on the bottom thereof, the 'inner flasks being frusto-conical in shape and the outermost flask having a cylindrical outer surface for engaging the inner surface of the body to hold the flasks co-axial to the body, each flask having an internal longitudinal rib and the inner flasks having each an external longitudinal groove for receiving the rib of the adjacent flasks, the opening in the side wall of the body being of sufficient size to permit the insertion and the removal of the flasks, a hollow plunger threaded into JAMES BERNARD SEDBERRY.

Witnesses:

J. F. WALSH, J. H. BLAIR.

' Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

